Start talking to shelters now! you can do it without telling them who you are. Many are not able to take pregnant women for liability issues. Know where you can go before you have to. I am in IN and when I was working for a shelter we had one that accepted pregnant girls up to age 15 and then ours that took the rest. There are a few more options here once the baby is born but they are still limited and you don't want your baby born on the streets. I pray that things are better where you are but you need to find out now!
Also... Many stores out here will give you your prenatal vitimins free if you cannot pay for them. Even if you are not able to get any other prenatal care please look into programs like these!